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Electric tuning of ferroelastic domain walls in strontium titanate (SrTiO3) dramatically alters the magnetic domain structure of adjacent lanthanum strontium manganite (La1/2Sr1/2MnO3). This demonstrates a novel method for controlling interfacial magnetic properties using domain wall physics.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Solid State Chemistry

Background:

  • Interface physics in oxide heterostructures is crucial for developing novel electronic and magnetic materials.
  • Domain walls (DWs) in ferroic materials represent naturally occurring interfaces with unique properties.
  • Emerging phenomena at interfaces can be harnessed for advanced functionalities.

Purpose of the Study:

  • To investigate the impact of electrically tuning ferroelastic domain walls in SrTiO3 on adjacent magnetic layers.
  • To explore the role of polar regions at SrTiO3 twin boundaries in modulating magnetic properties.
  • To demonstrate a new approach for manipulating interfacial properties through domain wall interactions.

Main Methods:

  • Epitaxial growth of La1/2Sr1/2MnO3 on SrTiO3 substrates.
  • Electrical modulation of ferroelastic domain walls in SrTiO3.
  • Characterization of magnetic domain structure and its correlation with domain wall properties.

Main Results:

  • Electric tuning of SrTiO3 ferroelastic domain walls induced significant changes in the magnetic domain structure of the La1/2Sr1/2MnO3 layer.
  • The magnetic properties were found to be strongly linked to polar regions at SrTiO3 twin boundaries, which are electrically tunable.
  • Tunable macroscopic responses in the magnetic layer were achieved by exploiting the responsiveness of domain wall nanoregions.

Conclusions:

  • Polar domain walls in SrTiO3 can be utilized to trigger adjustable responses in neighboring magnetic layers.
  • This work presents a new paradigm for manipulating interfacial emergent properties by electrically controlling domain walls.
  • The findings open avenues for novel device applications based on tunable interfacial physics.